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Mechanical Engineering Interview Questions

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Pressure v/s stress

Asked By: vrsaikumar | Asked On: Jun 25th, 2009

Though units for pressure and stress are same (i.E n/mm2)what is the difference between stress and pressure?

Answered by: gaurav on: May 18th, 2013

stress is the after effect of pressure.

Answered by: abhinav kumar on: Apr 17th, 2013

generally, pressure and stress can be distinguished by the point of application where it is applied,
if we are applying in fluid parameter then it is pressure and in solid state parameter then it will be stress.

Thermodynamics

Asked By: deemech | Asked On: Jul 11th, 2010

Why condenser is needed in steam power plant?

Answered by: Mahesh Patnala on: May 16th, 2013

Condenser improves P.Plant performance by reducing the pressure(due to change in phase i.e gas to liquid) at outlet of turbine.

Answered by: jayakrishna on: Mar 22nd, 2013

Condenser changes vapour to liquid phase at constant pressure because pumping of vapour is not possible by pump.

What is the exact difference between refrigerator and a air conditioner ?

Asked By: Vignesh Sri | Asked On: Sep 6th, 2011

Answered by: rafa on: May 13th, 2013

AC can be used as heat pump and refrigerator where as the refrigerator cannot be used as heat pump.

Answered by: anuvasamsetty on: May 6th, 2013

refrigerator is not designed for human comfort whereas ac is designed for human comfort for above 18 Celsius refrigerator for 0 or less than 0 degree Celsius

Hvac design

Asked By: heatguy | Asked On: Feb 2nd, 2013

When designing a hvac system how is total cfm distribution matched against fan cfm distribution?

Answered by: ravisastry on: May 10th, 2013

Heating ventilation and air conditioning

Explain two stroke and fore stroke si & ci engine

Asked By: karthikeyan.M | Asked On: Nov 25th, 2011

Answered by: Mohan raj on: May 5th, 2013

if the suction,compression, power and exhaust are completed in two strokes of the piston, i.e one revolution of crank shaft, it is called as two stroke and if the four processes completed in four strokes of the piston, i.e two rev of crank shaft,it is called as four stroke engine.

Answered by: Manpreet Singh on: May 10th, 2012

In two stroke SI & CI engine , there are two stroke of piston and one revolution of crankshaft to complete one cycle.....IN two stroke engine there are ports... But IN four stroke SI &CI engine , the...

Ic engine

Asked By: mvsrprakash | Asked On: Jan 6th, 2013

What will happen by pouring diesel in petrol engine instead of petrol ?

Answered by: dibyaranjan nath on: Apr 26th, 2013

IC engine means what?

Answered by: Bhushan Kulkarni on: Apr 14th, 2013

two things may happen:

1)knocking will occur since diesel oil has low octane number 30-40.

2)ignition will not takes place since diesel has to reach certain temp for ignition which generally happens in CI engine.

Parameter for compressible flow?

Asked By: parashargunjan | Asked On: Apr 26th, 2013

As generally there are two parameter for estimating the compressible nature of fluids - bulk modulus and compressibility which are reciprocal of each other , which one is used where, when and with what things?

Screw compressor

Asked By: sivajimalla | Asked On: Sep 25th, 2011

What is the clearance between male and female screws

Answered by: vishal kumar on: Apr 20th, 2013

0.01mm clearance

Answered by: soumendu saha on: Dec 20th, 2012

0.01 to 0.03

Gear & pinion material

Asked By: rajivg66 | Asked On: Apr 20th, 2013

How to select the gear & pinion material and which material effective selection

How many types of gear boxes are there?

Asked By: aidan_suzlon | Asked On: Jul 16th, 2008

Star Read Best Answer

Editorial / Best Answer

Answered by: bala

View all answers by bala

Member Since Nov-2005 | Answered On : Aug 2nd, 2008

Thare are 4 types of gear box.
1. sliding mesh gear box.
2.constant mesh gear box.
3.synchromesh gear box.
4.planetarty gear box.

Answered by: DULAL DINDA on: Apr 17th, 2013

there are basic three types of gear box-

1> slidingmesh
2> constsntmesh
3> synchromesh

Answered by: praveen on: Oct 5th, 2012

Constant mesh gear box 
sliding mesh gear box
synchro mesh gear box 

What is the main advantage of increasing of c.C. In 4stroke engine?

Asked By: ritesh sonker | Asked On: Feb 26th, 2007

Answered by: Bhushan Kulkarni on: Apr 14th, 2013

C.C. means cubic capacity.capacity increases means space for charge(air-fuel mixture) increases ultimately more burning of fuel means MORE POWER.

Answered by: sridhar on: Nov 7th, 2012

c.c means cylinder capacity or cubic centimeter capacity of the cylinder by increasing the c.c the volume of the cylinder becomes more and it can able to burn more fuel at a time . while burning more ...

How many degrres of freedom does a truss element have and brief them?

Asked By: ASHOK | Asked On: Nov 21st, 2011

Answered by: shankar on: Apr 1st, 2013

truss is a stable structure, it exerts only force and no movement .Hence it has zero dof.

Answered by: moosa alias mohasin on: Dec 13th, 2011

ZERO
Because it transmit only force, not motion.
So it has no moving element

Lathe and milling machines

Asked By: sanjaymanral | Asked On: Aug 14th, 2010

What is the difference between lathe & milling machine? What are the operations that we cannot perform in lathe but milling?

Answered by: karthik D on: Mar 29th, 2013

In Lathe w.piece rotates and the tool is stationary
In Milling machines it is vice versa of lathe.

Answered by: wishabc on: Mar 26th, 2013

In lathe machine cutting tool is stationary and work-piece is rotated , in case of milling machine work-piece remains stationary and cutting tool is rotated.

Refrigeration

Asked By: kabir4job | Asked On: Sep 16th, 2011

Explain about different types of refrigeration and where they are used ?

Answered by: hamada1989 on: Mar 11th, 2013

There are 5 types:_
1-vapor compression
2-vapor absorption
3-Thermo electric refrigeration
4-Thermo acoustic refrigeration
5-cryogenic refrigeration

Answered by: arpit saxena on: Oct 9th, 2012

there are 8 types of refrigation
1-ice refrigation
2-dry ice refrigation
3-evprotive type refrigation
4-air expanshion
5-cooling by theroutling
6-vapur absobsn system
7-vapur compeision system
8-thermo electric refrigation

What is the main advantage of increasing cubic capacity in four stroke ic engine?

Asked By: manoj | Asked On: Feb 27th, 2007

Answered by: saravanakumar on: Mar 7th, 2013

If the volumetric efficiency increases the power had rise due to that pulling had raises

Answered by: pradeep khanduja on: May 4th, 2007

Sir,
For increasing the power requirement we need to increase cubic capacity of liquid.

Regards
Pradeep Khanduja

Stress intensity and von misses stress

Asked By: arsalan64 | Asked On: Aug 8th, 2012

In ansys software we have options for stress intensity solution and von misses analysis rather than tresca. I want to inquire the difference between stress intensity analysis and von misses analysis?

Answered by: achyuth on: Feb 15th, 2013

According theory of failures von misses stress theory will give you a safe and economic design (Sys/Syt =0.57)

Answered by: Gani on: Oct 13th, 2012

von miss.. result is average of results in all co-ordinates...

Ss 316 specification of hardness

Asked By: RAKESH SHAH | Asked On: Jul 20th, 2011

How many 5 m dia hardness in bhn of 316 material we are facing the problem in machining & tolling not work properly

Answered by: M kashif on: Jan 20th, 2013

Why are we written SS-316 what is meaning of 3,1,and 6 please send me in detail answer

Answered by: kishan tiwari on: Nov 3rd, 2011

The 316 family is a group of austenitic stainless steels with superior corrosion resistance , Grade specifications for 316 grade stainless steels.

Ic engine efficiency

Asked By: anurag_mechanical | Asked On: Apr 2nd, 2010

With increasing temperature of intake air ic engine efficiency will increase or decrease? Explain

Answered by: vishwa on: Jan 12th, 2013

The unwanted sound coming from the engine due to the rapid pressure rise is called Knocking

Answered by: Awais on: Jan 11th, 2013

Higher intake temperature of inlet gasses (without effective compression through a turbo charger or supercharger ) will result in decrease in volumetric efficiency of the engine as less air will enter inside the cylinder due to lower density of air fuel mixture.

Convert square block to circular shaft

Asked By: NSK7777 | Asked On: Aug 16th, 2009

Which operation converts the square block into circular shaft?

Answered by: Awais on: Jan 11th, 2013

Lathe machine can effectively do so. By turning and cutting operation through employing the workpiece in the jig of the machine

Answered by: shashank khandelwal on: Dec 16th, 2012

Forging & Casting (after melting) etc.

How to calculate the weight of a thin plate of sheet and a tube?

Asked By: NIBU T JOHN | Asked On: Aug 29th, 2011

Answered by: ENG/Ali salah on: Dec 4th, 2012

*Weight Volume*Density =length*breadth*height(thickness)*Dens… WHERE, length is in meter, breadth is in meter, thickness is in meter, density is in kg/m^3 now, its depends upon the steel to calcula...

Answered by: Ashim Bhowmick on: Dec 14th, 2011

Weight calculation for Plate,Flat,Sheet in MS materials is = (Width X Thick x7.85)/1000 kg/Mtr.

Now from the ans. we can calculated the weight of different length picess.

For Ms Tube

2 x pie x r= ----mm
( eg. OD.30 /Th.10 / ID 10 mm
2x3.14x10 =62.8mm
Now( 62.8x10x7.85)/1000=4.92kg/mtr.

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